two things: ...bought this nice 6X7 120mm RH10 roll film holder thinking it would fit my 4X5 Crown, but it is apparently too small...need I buy a correctly sized RH10, or is there a 4X5 adapter available for this one...

...and, I have the Graflok back...how does the roll film holder (when properly sized) fit the Graflok--looks like I have to remove the Graflok..._________________...I am constantly amazed...

You need the correct one for 4X5. They made sizes to fit 2X3 up to 4X5. To install the roll holder on a Graflok back, press down on the two chrome arms and slide the focus panel off to the right. The roll holder goes where the focus panel was and is held on by sliding the two chrome strips to lock it in place. When you want to replace the focus panel, remove the roll holder, lay the panel in place and slide to the left. The arms should click into place. Pretty simple arrangement. Good luck with your endeavor._________________Glenn

While I have only a 2 x 3 Speed Graphic and an RH8 to fit it, I have seen larger ones and roll holders for the 4 x 5. It appears to me that the difference is only the base plate that fits the back of the camera. The various roll holders appear fairly regularly on the auction site so I would suggest listing the one you have there and using the proceeds from the sale of it to purchase one of the right size. If the width of the base plate is about 3 1/8" you have one for a 2 x 3 camera. Hopefully someone else can give you the width of the base plate of the ones for 3 x 4 and 4 x 5 cameras.

Thanks for those replies...they verify what I feared as I opened up the package and saw the smaller back, and I guess it's off to eBay to sell...

..however...as I looked through the sites and vendors, I began to think that maybe the Cambo C2 (n?) type of slide-under-the-Graflok might make more sense...any experience with these?...

...one other thing that dawned on me as I researched: the view through any of the Crown finders, including ground glass, is a 4X5 view...how do you compensate your viewing to account for the smaller film window?...or am I missing something with the concept?..._________________...I am constantly amazed...

Thanks once again to the community for the replies and advice--I finally get it, though I'm having second thoughts after seeing 45PSS's camera with the sports finder masked. I could do that, and I could also mask the ground glass, but I just don't think I want to go into all that. The whole idea of the 6X7 (and an earlier post about 2X3) was to use my 120mm Patterson tanks for daylight developing, and make life easy for me, but it looks like I'll probably stick with 4X5 and Jobo et al.

ps: Bruiser: quite a site you've got there, and my favorite piece was the Simmons Combat camera with the lens cap that transforms to a viewfinder--eat your heart out, Linhof!_________________...I am constantly amazed...

hey vincent
I know that this mite not be that big of a deal now but
I have been looking for this & just found it in my stuff
Graflex made a clear plastic Sports Viewfinder Mask
that snaps in to your wire Sports finder (like 45PSS
shows ) IT has marks on it for the roll film backs
catalog #9103 also on most graflex press camera
{ not super garphic/ super speed } with the optical
viewfinder you can change the mask in it. go to
http://www.graflex.org/speed-graphic/viewfinder-masks.html
in witch you pick Image Size then lens to get a mask size
so like RH10 { use 2-1/4" x 3-1/4" } with a 127mm lens would
a #9 mask and [i]also I have seen a chart[/i] that showed what mask
to use with tele-lens like a 270mm on a 4x5 would
a #6 mask as of now I can't find this chart